Nowadays, almost all the timing chains of new car engines are still not durable. If they are not replaced in time, a major accident will occur, and they have been eliminated.
The low performance of the tappet is eliminated.
I don't know if the gear type is used in automobile engines. Because the camshaft is far from the crankshaft, it requires several stages of gear transmission, which is difficult to be compact enough, the cost is high, and the noise is high. Generally, it may only be used by engines that pursue performance.
The drive shaft with bevel teeth is only seen on a few motorcycles and industrial general-purpose internal combustion engines.
